Shandong Leahou Light Industrial of New Material Co.

Jinan, China

Shandong Leahou Light Industrial of New Material Co.

Jinan, China
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Wang S.P.,Shandong Polytechnic University | Wang S.P.,Shandong Leahou Light Industrial of New Material Co. | Yang X.D.,Shandong Polytechnic University | Bai Q.Q.,Shandong Leahou Light Industrial of New Material Co. | Li T.D.,Shandong Polytechnic University
International Journal of Polymer Analysis and Characterization | Year: 2013

A comparative kinetic study of the urethane reactions of phenyl isocyanate and 1,2-, 1,3-, and 1,4-butanediol was carried out in dichloromethane solution with zirconium (IV) acetylacetonate as catalyst. In situ FT-IR was used to follow the kinetics of the reactions at a constant temperature of 15°-30°C. The rate constants for the reaction of the primary hydroxyl group and the secondary hydroxyl group were calculated as kprim and ksec, respectively. Analysis of the second-order rate constants of these systems indicated that kprim follows 1,2-butanediol >1,3-butanediol >1,4-butanediol. The ratio of kprim/ksec in 1,2-butanediol was the highest and the order followed was the same as with the reaction rate. Activation energies and Eyring parameters were also determined for the urethane reaction of butanediols. © 2013 Copyright Taylor and Francis Group, LLC.


Wang S.,Shandong Polytechnic University | Wang S.,Shandong Leahou Light Industrial of New Material Co. | Yang X.,Shandong Polytechnic University | Bai Q.,Shandong Leahou Light Industrial of New Material Co. | Li T.,Shandong Polytechnic University
International Journal of Polymer Analysis and Characterization | Year: 2013

A number of tertiary amines and organotin catalysts for the phenyl isocyanate- 1,2-propylene glycol reaction were investigated by using in situ FT-IR. The reaction rate of each hydroxyl group, which is defined as the ratio between the rate constant of the secondary hydroxyl group and the rate constant of the primary hydroxyl group, is described with a second-order equation. The influence of different catalyst concentrations as well as the reaction temperature is discussed. It is observed that the selectivity depends on temperature but not on concentration, and stannous octoate is the most effective catalyst. The thermodynamic parameters were determined for the catalyzed reactions, primary and secondary hydroxyl groups being differentiated. © 2013 Copyright Taylor and Francis Group, LLC.


Wang S.,Shandong Polytechnic University | Wang S.,Shandong Leahou Light Industrial of New Material Co. | Yang X.,Shandong Polytechnic University | Bai Q.,Shandong Leahou Light Industrial of New Material Co. | Li T.,Shandong Polytechnic University
International Journal of Polymer Analysis and Characterization | Year: 2013

The urethane reaction of phenyl isocyanate and 1,2-propylene glycol was investigated with ferric acetylacetonate (Fe(acac)3) as catalyst. The effect of the catalytic properties of Fe(acac)3 on the formation of the urethane bond was evaluated with in situ FT-IR. The influence of the Fe(acac)3 concentration as well as the reaction temperature is discussed. It was observed that there was a turning point in the reaction rate when the temperature decreases, which remained unchanged with variation in Fe(acac)3 concentration. Arrhenius and Eyring parameters of the primary hydroxyl group were determined for the catalyzed reaction. The low-temperature and high-temperature values are surprisingly different. A reasonable reaction mechanism is proposed and the possible active species are discussed, followed by a kinetics and thermodynamics discussion. ©Taylor & Francis Group, LLC.

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